The biological half-life of 99m Tc macroaggregated albumin in the lungs is 6 hours. What is the effective half-life of this agent in the lungs? 8. How many counts are needed to make the standard deviation equal to 1%? 9. A series of 100 1-minute measurements were made, giving an average count rate of 1600 counts per minute.
Nuclear decay is an example of a purely statistical process. A more precise definition of half-life is that each nucleus has a 50% chance of living for a time equal to one half-life t 1 / 2 t 1 / 2 size 12{t rSub { size 8{1/2} } } {}. Thus, if N N size 12{N} {} is reasonably large, half of the original nuclei decay in a time of one half-life
How much grams of a substance will be left after 2 hours if its half life is 15 minutes? Question #e2e73 Question #72f8f If actinium 227 has a half life of 21.77 years, how many years have gone by if actinium-227 undergoes 3 half-lives? In 5.49 seconds, 1.20 g of argon-35 decays to leave only .15 g.half-life = 5,715 years. total time of decay = 17,190 years. initial amount = 70.0 mg. number of half-lives past: 17,190/5,715 = 3 half-lives. 3 half-lives = 1/8 remains. 100.mg x 1/8 = 12.5 mg. alpha particle. a charged particle consisting of 2 protons and 2 neutrons emitted from the nucleus during radioactive decay. beta particle.
Y4kCLmH. how many hours is half life 2
